How do I run apps in background?

MIT App Inventor Help
1

I have html and js running a worker job to collect records from a server and display on the screen. I wanted this app to poll my server even when running in the background.

I was able to build an example on the PC using a js service worker. But it doesn't seem like MIT App Inventor supports that?

Is it possible to do this in HTML and JS? If not, what else could be used?

2
4

Does this Itoo tool allow fetch calls on createProcess block?

5

Why not try it, and find out?